Anti-loosening screw pair and anti-loosening screw component

ABSTRACT

The present disclosure provides an anti-loosening screw pair and an anti-loosening screw component. The screw pair includes a first screw component provided with a first screw thread and a second screw component whose outer wall surface is provided with a second screw thread. The first and second screw components are in threaded connection. In a direction of the first screw component being screwed into the second screw component, sides of the first and second screw threads pressing against each other are formed into force-bearing fitting faces respectively, and opposite sides thereof are formed into non-force-bearing fitting regions respectively. At least one of the force-bearing fitting faces and the non-force-bearing fitting regions of the first and the second screw components is provided with a stopper so as to prevent radial displacement between the first and the second screw components.

CROSS-REFERENCE TO RELATED APPLICATION

This application is the U.S. national phase of PCT application No.PCT/CN2018/072390 filed on Jan. 12, 2018, which claims priority toChinese patent applications No. 201711443249.X filed on Dec. 27, 2017and No. 201711346723.7 filed on Dec. 15, 2017, the disclosures of whichare incorporated in their entirety by reference herein.

TECHNICAL FIELD

The present disclosure relates to the field of mechanical connectiontechnology, and in particularly to an anti-loosening screw pair and ananti-loosening screw component.

BACKGROUND

Threaded connection is one of the most widely used connecting methods insuch industries as machinery, construction, transportation, aerospace,shipping, furniture etc., the threaded connection may generate a greatconnecting force, is easy for repeated assembly and disassembly, andeasy to be produced in enormous quantities as well as with lower cost.

However, in complex working conditions (e.g., vibration, impact,alternating temperature etc.), the threaded connection is prone to looseand fail. Thread looseness not only reduces the connecting force, butalso induces an integral fracture of a threaded connection structurecomponent (e.g., bolt), thereby causing severe safety incidents.

SUMMARY

In view of the foregoing, the present disclosure provides ananti-loosening screw pair and an anti-loosening screw component.

To solve the above technical problem, the present disclosure adopts thefollowing technical solutions.

An anti-loosening screw pair according to a first aspect of the presentdisclosure includes:

a first screw component having an inner hole, an inner wall surface ofthe inner hole being provided with a first screw thread extending alonga spiral line thereof; and

a second screw component having a rod-shaped structure, an outer wallsurface of the rod-shaped structure being provided with a second screwthread extending along a spiral line thereof and corresponding to thefirst screw thread, and the second screw component being in threadedconnection with the first screw component,

wherein in a direction of the first screw component being screwed intothe second screw component, sides of the first screw thread and thesecond screw thread pressing against each other are formed intoforce-bearing fitting faces respectively, opposite sides thereof areformed into non-force-bearing fitting regions respectively, and at leastone of the force-bearing fitting faces and the non-force-bearing fittingregions (including a force-bearing fitting face and a non-force-bearingfitting region of the first screw component, a force-bearing fittingface and a non-force-bearing fitting region of the second screwcomponent) of the first screw component and the second screw componentis provided with a stopper so as to prevent radial displacement betweenthe first screw component and the second screw component.

Optionally, the force-bearing fitting face of the first screw componentand/or the second screw component is provided with the stopper.

Optionally, one of the first screw component and the second screwcomponent is provided with the stopper.

Optionally, the force-bearing fitting face of the first screw thread isprovided with the stopper.

Optionally, the stopper comprises a protrusion protruding toward theforce-bearing fitting face of the second screw thread, the protrusionpresses against the force-bearing fitting face of the second screwthread as the first screw component and the second screw component arebeing screwed together so as to form a groove therein, and theprotrusion is engaged with the groove so as to prevent the radialdisplacement between the first screw component and the second screwcomponent.

Optionally, the stopper comprises one or more protrusions.

Optionally, the first screw component and the second screw component areprovided with the stoppers respectively.

Optionally, the stopper includes a first fitting portion arranged on thefirst screw component and a second fitting portion arranged on thesecond screw component, and the first fitting portion is engaged withthe second fitting portion so as to prevent the radial displacementbetween the first screw component and the second screw component.

Optionally, the first fitting portion comprises a protrusion arranged onthe first screw thread, the second fitting portion comprises a groovearranged in the second screw thread, and the protrusion is clipped intothe groove.

Optionally, the first fitting portion comprises a groove arranged in thefirst screw thread, the second fitting portion comprises a protrusionarranged on the second screw thread, and the protrusion is clipped intothe groove.

Optionally, the first fitting portion comprises both a protrusionarranged on the first screw thread and a groove arranged in the firstscrew thread, the second fitting portion comprises both a groovearranged in the second screw thread and a protrusion arranged on thesecond screw thread, the protrusion on the first screw thread is clippedinto the groove in the second screw thread, and the protrusion on thesecond screw thread is clipped into the groove in the first screwthread.

Optionally, a fitting clearance is presented between the protrusion andthe groove engaged therewith.

Optionally, a shape of the protrusion corresponds to that of the grooveengaged therewith, and the protrusion is closely engaged with thegroove.

Optionally, one or more protrusions and one or more grooves areprovided.

Optionally, the first fitting portion comprises a first stepped portionarranged on the first screw component, and the second fitting portioncomprises a second stepped portion arranged on the second screwcomponent.

Optionally, the first fitting portion comprises one or more firststepped portions.

Optionally, the non-force-bearing fitting region of the first screwcomponent and/or the second screw component is provided with thestopper.

Optionally, the non-force-bearing fitting regions of the first screwcomponent and the second screw component are provided with the stoppersrespectively.

Optionally, the stopper includes a third fitting portion arranged on thefirst screw component and a fourth fitting portion arranged on thesecond screw component, and the third fitting portion is engaged withthe fourth fitting portion so as to prevent the radial displacementbetween the first screw component and the second screw component.

Optionally, the third fitting portion comprises a protrusion arranged onthe first screw thread, the fourth fitting portion comprises a groovearranged in the second screw thread, and the protrusion is clipped intothe groove.

Optionally, the third fitting portion comprises a groove arranged in thefirst screw thread, the fourth fitting portion comprises a protrusionarranged on the second screw thread, and the protrusion is clipped intothe groove.

Optionally, the third fitting portion comprises both a protrusionarranged on the first screw thread and a groove arranged in the firstscrew thread, the fourth fitting portion comprises a groove arranged inthe second screw thread and a protrusion arranged on the second screwthread, the protrusion on the first screw thread is clipped into thegroove in the second screw thread, and the protrusion on the secondscrew thread is clipped into the groove in the first screw thread.

Optionally, a fitting clearance is presented between the protrusion andthe groove engaged therewith.

Optionally, a shape of the protrusion corresponds to that of the grooveengaged therewith, and the protrusion is closely engaged with thegroove.

Optionally, one or more protrusions and one or more grooves areprovided.

Optionally, the force-bearing fitting face and the non-force-bearingfitting region of the first screw component and/or the second screwcomponent are provided with the stoppers respectively.

An anti-loosening screw component according to a second aspect of thepresent disclosure includes both the first screw component and thesecond screw component according to the embodiments of the first aspect,wherein the force-bearing fitting face and/or the non-force-bearingfitting region of the first screw component or the second screwcomponent is provided with the stopper.

Optionally, the anti-loosening screw component comprises the first screwcomponent, and the force-bearing fitting face and/or thenon-force-bearing fitting region of the first screw component isprovided with the stopper.

Optionally, the anti-loosening screw component comprises the secondscrew component, and the force-bearing fitting face and/or thenon-force-bearing fitting region of the second screw component isprovided with the stopper.

Advantageous effects of the above technical solutions of the presentdisclosure are as follows.

By arranging the stopper on at least one of the force-bearing fittingfaces and the non-force-bearing fitting regions of the first screwcomponent and the second screw component, the anti-loosening screw pairaccording to embodiments of the present disclosure effectively preventsradial displacement between thread fitting faces of the first screwcomponent and the second screw component. The anti-loosening screwcomponent according to the embodiments of the present disclosure may beused in combination to compose the above anti-loosening screw pair, orbe independently used as anti-loosening structures respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe technical solutions in embodiments of the presentdisclosure or in the related arts more clearly, attached drawings usedfor describing the embodiments will be briefly described hereinafter.Obviously, the drawings referenced in the following description aremerely shown some of the embodiments of the present disclosure, and aperson skilled in the art may also obtain other drawings from thosedescribed ones without paying any creative labor.

FIG. 1 is a sectional view of an anti-loosening screw pair according toa first embodiment of the present disclosure;

FIG. 2 is another sectional view of the anti-loosening screw pairaccording to the first embodiment of the present disclosure;

FIG. 3 is a partial enlarged view of section A in FIG. 2;

FIG. 4 is a sectional view of an anti-loosening screw pair according toa second embodiment of the present disclosure;

FIG. 5 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 6 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 7 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 8 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 9 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 10 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 11 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 12 is another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 13 is yet another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 14 is still another sectional view of the anti-loosening screw pairaccording to the second embodiment of the present disclosure;

FIG. 15 is a sectional view of the anti-loosening screw pair accordingto a third embodiment of the present disclosure;

FIG. 16 is a sectional view of an anti-loosening screw pair according toa fourth embodiment of the present disclosure;

FIG. 17 is another sectional view of the anti-loosening screw pairaccording to the fourth embodiment of the present disclosure;

FIG. 18 is yet another sectional view of the anti-loosening screw pairaccording to the fourth embodiment of the present disclosure;

FIG. 19 is a sectional view of an anti-loosening screw pair according toa fifth embodiment of the present disclosure; and

FIG. 20 is a sectional view of an anti-loosening screw pair according toa sixth embodiment of the present disclosure.

DETAILED DESCRIPTION

In order to clarify the objects, technical solutions and advantages ofthe embodiments of the present disclosure, technical solutions of theembodiments will be clearly and completely described hereinafter inconjunction with the drawings thereof. Obviously, the describedembodiments are merely parts of, rather than all of, the embodiments ofthe present disclosure. Based on the described embodiments of thepresent disclosure, all of other embodiments obtained by a personskilled in the art shall also fall within the protection scope of thepresent disclosure.

An anti-loosening screw pair 100 according to a first aspect of thepresent disclosure will be specifically described hereinafter inconjunction with the drawings.

As shown in FIG. 1 to FIG. 20, the anti-loosening screw pair 100according to an embodiment of the first aspect includes a first screwcomponent 10 and a second screw component 20.

The first screw component 10 has an inner hole, and an inner wallsurface of the inner hole is provided with a first screw threadextending along its spiral line. The second screw component 20 has arod-shaped structure, and an outer wall surface of the rod-shapedstructure is provided with a second screw thread extending along itsspiral line and corresponding to the first screw thread. The secondscrew component 20 is in threaded connection with the first screwcomponent 10. In a direction of the first screw component 10 beingscrewed into the second screw component 20, sides of each of the firstscrew thread and the second screw thread pressing against each other areformed into force-bearing fitting faces respectively, and opposite sidesthereof are formed into non-force-bearing fitting regions respectively.At least one of the force-bearing fitting faces and thenon-force-bearing fitting regions (including a force-bearing fittingface and a non-force-bearing fitting region of the first screw component10 as well as a force-bearing fitting face and a non-force-bearingfitting region of the second screw component 20) of each of the firstscrew component 10 and the second screw component 20 is provided with astopper so as to prevent radial displacement between the first screwcomponent 10 and the second screw component 20.

The anti-loosening screw pair 100 according to the present embodimentmainly consists of the first screw component 10 and the second screwcomponent 20. The inner hole may be formed inside the first screwcomponent 10, and the first screw thread extending along its spiral linemay be formed on the inner wall surface of the inner hole. The secondscrew component 20 may comprise a rod-shaped structure, and the secondscrew thread extending along its spiral line may be formed on the outerwall surface of the rod-shaped structure. The second screw thread andthe first screw thread may correspond to each other.

The second screw component 20 may be in threaded connection with thefirst screw component 10. When the anti-loosening screw pair 100 isbeing tightened, an interacting force may be formed between the firstscrew component 10 and the second screw component 20, and theinteracting force may include a pressing force and a frictional force.In such a case, in the direction of the first screw component 10 beingscrewed into the second screw component 20, sides of the first screwthread and the second screw thread pressing against each other may beformed into force-bearing fitting faces respectively, and theinteracting force formed between the first screw component 10 and thesecond screw component 20 is mainly generated on the force-bearingfitting faces.

Sides of the first screw thread and the second screw thread opposite tothe force-bearing fitting faces are formed into non-force-bearingfitting regions respectively. In the non-force-bearing fitting regions,there may be a geometrical matching relationship between the first screwcomponent 10 and the second screw component 20, but obvious interactionforce may not be produced therebetween. In addition, in thenon-force-bearing fitting regions, physical contact may not be generatedbetween the first screw component 10 and the second screw component 20,but can present therebetween a certain fitting clearance 70.

The stopper may be formed on at least one of the force-bearing fittingfaces and the non-force-bearing fitting regions of the first screwcomponent 10 and the second screw component 20, and radial displacementbetween the first screw component 10 and the second screw component 20may be prevented by the formed stopper.

It should be noted that, in the embodiments of the present disclosure,screw thread refers to a tooth body which has some sort of threadprofile and protrudes periodically along its spiral line on a surface ofa revolving body such as a column, a cone or others. The thread profileis a sectional profile shape of the screw thread in a plane through anaxis of the above column, cone or other revolving bodies. Ordinarythread profile includes triangular, trapezoidal, rectangular and zigzagshapes etc. The screw thread may be either left-handed or right-handed,and may be either single-threading or multi-threading.

A screw pair usually includes an internal thread and an external thread(simply as “internal and external threads”), as for the presentembodiment, the screw pair includes the first screw component 10 and thesecond screw component 20, so that the thread arranged on the wallsurface of the inner hole (the inner hole is in a shape of a revolvingbody such as a column, a cone or others) of the first screw component 10may be expressed as an internal thread, and the thread arranged on theexternal surface of the rod-shaped structure (the rod-shaped structureis also in a shape of a revolving body such as a column, a cone orothers) of the second screw component 20 may be expressed as an externalthread. Central axes of the revolving body features in the shape of acolumn, a cone or others included in the first screw component 10 andthe second screw component 20 are referred to as axes of the first screwcomponent 10 and of the second screw component 20, and ideally, the axisof the first screw component 10 and the axis of the second screwcomponent 20 are coincide with each other. A direction perpendicular tothe axis of the first screw component 10 is called a radial direction ofthe first screw component 10, and a direction perpendicular to the axisof the second screw component 20 is called a radial direction of thesecond screw component 20.

It should be noted that, the first screw component 10 may be representedas a complete part including an internal thread, such as a screw nut, ascrew cap or others, and may also be represented as a partial region ona complex structure including an internal thread feature, such as apartial region on an engine cylinder block provided with an internalthread, or a partial region on a large bridge structure provided with aninternal thread, all of which may be regarded as the first screwcomponent 10. In a word, as long as an internal thread feature isincluded, whether a complete part or a partial region on a structure canboth be regarded as the first screw component 10. Meanwhile, the secondscrew component 20 may be represented as a complete part including anexternal thread, such as a bolt, a screw nail or others, and may also berepresented as a partial region on a complex structure including anexternal thread feature, for example, end regions on some enginespindles provided with an external thread, all of which may also beregarded as the second screw component 20. In a word, as long as anexternal thread feature is included, whether a complete part or apartial region on a structure can both be regarded as the second screwcomponent 20.

After the screw pair is tightened, an interaction force, including apressing force and a frictional force, will be formed between theinternal and external threads. After the screw pair is tightened, theforce-bearing fitting faces will be formed on the internal and externalthreads, and the interaction force between the internal and externalthreads is mainly acted on the force-bearing fitting faces.

After the screw pair is tightened, besides the force-bearing fittingfaces, sides of the internal and external threads opposite to theforce-bearing fitting faces are called non-force-bearing fittingregions. In the non-force-bearing fitting regions, there is ageometrical matching relationship between the internal and externalthreads, but an obvious interaction force will not necessarily begenerated therebetween. In the non-force-bearing fitting regions,physical contact may not be generated between the internal and externalthreads, but instead, a certain fitting clearance 70 may be presented.

In the embodiments of the present disclosure, the force-bearing fittingfaces are also called thread fitting faces, or fitting faces for short.Fitting faces formed by engagement between ordinary internal andexternal threads is usually flat surfaces, but the fitting faces of thescrew pair including the screw threads according to the presentdisclosure may be curved surfaces.

The radial displacement described in the embodiments of the presentdisclosure may cause the axis of the first screw component 10 and theaxis of the second screw component 20 deviate from their normalcoincident locations. In other words, the radial displacement describedin the embodiments of the present disclosure may approximately cause thefirst screw component 10 and the second screw component 20 respectivelydisplaced or laterally displaced in directions perpendicular to theiraxes.

Thus, by arranging the stopper on at least one of the force-bearingfitting faces and the non-force-bearing fitting regions of the firstscrew component 10 and the second screw component 20, the anti-looseningscrew pair 100 according to the present embodiment effectively preventsthe radial displacement between the first screw component 10 and thesecond screw component 20 so as to increase connection tightness of theanti-loosening screw pair 100. The anti-loosening screw pair 100 isthereby easy to be disassembled, convenient for repeatedly usage, andhas high fatigue strength, appropriate tightening torque as well as awider application range.

According to one embodiment of the present disclosure, the force-bearingfitting face of the first screw component 10 and/or the second screwcomponent 20 is provided with the stopper.

The stopper may be formed on the force-bearing fitting face of the firstscrew component 10, and may also be formed on the force-bearing fittingface of the second screw component 20. The stopper may also be formed onthe force-bearing fitting faces of both of the first screw component 10and the second screw component 20 so as to effectively prevent theradial displacement in the anti-loosening screw pair 100.

In some specific embodiments of the present disclosure, one of the firstscrew component 10 and the second screw component 20 is provided withthe stopper.

The stopper may be formed on the force-bearing fitting face of the firstscrew component 10 or on the force-bearing fitting face of the secondscrew component 20 to prevent the radial displacement in theanti-loosening screw pair 100.

According to one embodiment of the present disclosure, as shown in FIG.1 to FIG. 3, the force-bearing fitting face of the first screw thread isprovided with the stopper.

The force-bearing fitting face of the second thread may be formed into aflat surface, a curved surface or into other shapes, and the stopper maybe formed on the force-bearing fitting face of the first thread. Whentightening the anti-loosening screw pair 100, the stopper may pressagainst the force-bearing fitting face of the second thread such thatthe latter is deformed, which causes meshing engagement between thefirst thread and the second thread on their force-bearing fitting facesso as to prevent the radial displacement in the anti-loosening screwpair 100.

Optionally, in some specific embodiments of the present disclosure, asshown in FIG. 2 and FIG. 3, the stopper comprises a protrusion 30protruding toward the force-bearing fitting face of the second screwthread, the protrusion 30 presses against the force-bearing fitting faceof the second screw thread as the first screw component 10 and thesecond screw component 20 are being screwed together so as to form agroove 40 therein, and the protrusion 30 is engaged with the groove 40so as to prevent the radial displacement between the first screwcomponent 10 and the second screw component 20.

The stopper may be provided with the protrusion 30, and the protrusion30 may protrude toward the force-bearing fitting face of the secondscrew thread. As the first screw component 10 and second screw component20 are being screwed together, the protrusion 30 may press against theforce-bearing fitting face of the second screw thread so that the latteris concavely deformed so as to form the groove 40 therein. Theprotrusion 30 may engaged with the groove 40 to prevent the radialdisplacement between the first screw component 10 and the second screwcomponent 20.

According to one embodiment of the present disclosure, the stopper maycomprise only one protrusion 30.

As shown in FIG. 1, one protrusion 30 may be formed on the force-bearingfitting face of the first screw thread, and the object of preventing theradial displacement between the first screw component 10 and the secondscrew component 20 can therefore be achieved by only providing oneprotrusion 30.

In some specific embodiments of the present disclosure, the stopper maycomprise a plurality of protrusions 30.

As shown in FIG. 2 and FIG. 3, the plurality of protrusions 30 may beformed on the force-bearing fitting face of the first screw thread andmay be spaced apart thereon so as to be evenly distributed or unevenlydistributed, and there is no limitation on the location and the quantityof the protrusions 30. The distribution of the protrusions 30 on theforce-bearing fitting face may either be periodical or non-periodical,all the designs thereof will be effective as long as they can preventthe radial displacement in the anti-loosening screw pair 100, and shallalso fall within the protection scope of the anti-loosening screw pair100 according to the embodiments of the present disclosure.

Optionally, according to one embodiment of the present disclosure, anend face of the protrusion 30 comprises an arcuate shape or an angularshape.

As shown in FIG. 1 to FIG. 3, the end face of the protrusion 30 maycomprise an arcuate shape or an angular shape. As a matter of course,the protrusion 30 may comprise varied shapes, for example, a single arc,a sharp angle or others, and the specific shape of the protrusion 30 mayalso be a combination of multiple different shapes, all the shapedesigns will be effective as long as they can prevent the radialdisplacement in the anti-loosening screw pair 100, and shall also fallwithin the protection scope of the anti-loosening screw pair 100according to the embodiments of the present disclosure.

According to one embodiment of the present disclosure, one of theinternal and external threads adopts a conventional thread profile, andthe other one includes a convex feature. When the screw pair istightened, the convex feature presses against a surface of acorresponding screw thread so that the surface is concavely deformed,the convex feature and the concavely deformed region come into contactwith each other, and at which location the fitted faces are formed intoforce-bearing fitting faces. The meshing engagement between the convexfeature and the concavely deformed region achieve the object ofpreventing the radial displacement in the screw pair. The shape of theconvex feature relating to the present embodiment may have variedshapes, for example, an arcuate shape, a sharp angular shape or others,and may also be a combination of multiple shapes. This design has nolimitation on the shape of the convex feature, and all the designsthereof will be effective as long as they can prevent the radialdisplacement.

In addition, there is no limitation on the location and the quantity ofthe convex feature on the thread fitting face according to the presentembodiment, and all the designs of the periodically or non-periodicallyarranged convex feature will be effectively employed as long as they canprevent the radial displacement.

In some other specific embodiments of the present disclosure, as shownin FIG. 4 to FIG. 15, the first screw component 10 and the second screwcomponent 20 are provided with the stopper respectively.

The force-bearing fitting faces of the first screw component 10 and thesecond screw component 20 may be provided with the stopper respectively,and through engagement of the stopper of the first screw component 10with the stopper of the second screw component 20, the radialdisplacement in the anti-loosening screw pair 100 can be effectivelyprevented.

According to one embodiment of the present disclosure, the stopperincludes a first fitting portion arranged on the thread fitting face ofthe first screw component 10 and a second fitting portion arranged onthe thread fitting face of the second screw component 20, and the firstfitting portion is engaged with the second fitting portion so as toprevent the radial displacement between the first screw component 10 andthe second screw component 20.

The stopper mainly includes the first fitting portion formed on thethread fitting face of the first screw component 10 and the secondfitting portion formed on the thread fitting face of the second screwcomponent 20, and the first fitting portion may engaged with the secondfitting portion so as to prevent the radial displacement between thefirst screw component 10 and the second screw component 20.

In some specific embodiments of the present disclosure, as shown in FIG.4 to FIG. 9, the first fitting portion comprises a protrusion 30arranged on the first screw thread, the second fitting portion comprisesa groove 40 arranged in the second screw thread, and the protrusion 30is clipped into the groove 40.

With the first fitting portion comprises the protrusion 30 on the firstscrew thread and the second fitting portion comprises the groove 40 inthe second screw thread, the protrusion 30 may be clipped into thegroove 40, and the meshing engagement between the protrusion 30 an thegroove 40 may produce a restraining effect on the radial displacement inthe anti-loosening screw pair 100.

In some other specific embodiments of the present disclosure,specifically as shown in FIG. 10, the first fitting portion comprises agroove 40 arranged in the first screw thread, the second fitting portioncomprises a protrusion 30 arranged on the second screw thread, and theprotrusion 30 is clipped into the groove 40.

With the first fitting portion comprises the groove 40 in the firstscrew thread and the second fitting portion comprises the protrusion 30on the second screw thread, the protrusion 30 may be snapped into thegroove 40, and the meshing engagement between the protrusion 30 and thegroove 40 may produce a restraining effect on the radial displacement inthe anti-loosening screw pair 100.

According to one embodiment of the present disclosure, the stopper maycomprise only one protrusion 30.

As shown in FIG. 8, one protrusion 30 may be formed on the force-bearingfitting face of the first screw thread, while one groove 40 engagedtherewith may be formed in the force-bearing fitting face of the secondscrew thread. Alternatively, specifically as shown in FIG. 10, oneprotrusion 30 may be formed on the force-bearing fitting face of thesecond screw thread, while one groove 40 engaged therewith may be formedin the force-bearing fitting face of the first screw thread. An objectof preventing the radial displacement between the first screw component10 and the second screw component 20 can therefore be achieved by onlyproviding one protrusion 30 on the force-bearing fitting face of thefirst screw thread and one groove 40 in the second screw thread.

In some specific embodiments of the present disclosure, the stopper maycomprise a plurality of protrusions 30 and grooves 40.

As shown in FIG. 4, FIG. 5 and FIG. 9, a plurality of protrusions 30 ofsame or different sizes may be formed on the force-bearing fitting faceof the first screw thread, and a plurality of grooves 40, which areengaged with the protrusions 30 respectively, may be formed in theforce-bearing fitting face of the second screw thread. Alternatively, aplurality of protrusions 30 of same or different sizes may be formed onthe force-bearing fitting face of the second screw thread, and aplurality of grooves 40, which are engaged with the protrusions 30respectively, may be formed in the force-bearing fitting face of thefirst screw thread. There is no limitation on the location and thequantity of protrusions 30 and the grooves 40, the distributions of theprotrusions 30 and the grooves 40 on the force-bearing fitting faces mayeither be periodical or non-periodical, all the designs thereof will beeffective as long as they can prevent the radial displacement in theanti-loosening screw pair 100, and shall also fall within the protectionscope of the anti-loosening screw pair 100 according to the embodimentsof the present disclosure.

In some other specific embodiments of the present disclosure, as shownin FIG. 11 to FIG. 15, the first fitting portion of the first screwthread may include both the protrusion 30 and the groove 40, and thesecond fitting portion of the second thread may also include both thegroove 40 and protrusions 30, which are engaged with the protrusion 30and the groove 40 of the first fitting portion respectively.

The first fitting portion may be provided with the protrusion 30 and thegroove 40 on and in the first screw thread, and the second fittingportion may be provided with the groove 40 and the protrusion 30 in andon the second screw thread. The protrusion 30 on the first screw threadmay be clipped into the groove 40 in the second screw thread, theprotrusion 30 on the second screw thread may also be clipped into thegroove 40 in the first screw thread, and the meshing engagement betweenthe protrusions 30 and the grooves 40 of the first screw thread and thesecond screw thread may produce a restraining effect on the radialdisplacement in the anti-loosening screw pair 100. There is nolimitation on the location and the quantity of the protrusions 30 andgrooves 40 of the first screw thread and the second screw thread, thedistributions of the protrusions 30 and grooves 40 on the force-bearingfitting faces may either be periodical or non-periodical, all thedesigns thereof will be effective as long as they can prevent the radialdisplacement in the anti-loosening screw pair 100, and shall also fallwithin the protection scope of the anti-loosening screw pair 100according to the embodiments of the present disclosure.

According to one embodiment of the present disclosure, a fittingclearance 70 is presented between the protrusion 30 and the groove 40engaged therewith.

As shown in FIG. 15, the size of the protrusion 30 may not be identicalwith that of the groove 40 engaged therewith, so that the fittingclearance 70 is presented therebetween when the protrusion 30 is engagedwith the groove 40.

Optionally, in some specific embodiments of the present disclosure, ashape of the protrusion 30 corresponds to that of the groove 40 engagedtherewith, and the protrusion 30 is closely engaged with the groove 40.

The shape of the protrusion 30 and that of the groove 40 engagedtherewith may correspond to each other, and the protrusion 30 mayclosely engaged with the groove 40.

According to one embodiment of the present disclosure, each of theprotrusion 30 and the groove 40 comprises a triangular, rectangular,trapezoidal, curved, hook-like, folded or irregular shape.

As shown in FIG. 4 to FIG. 15, each of the protrusion 30 and the groove40 may comprise a triangular, rectangular, trapezoidal, curved,hook-like, folded or irregular shape, and the shape of each of theprotrusion 30 and the groove 40 may also be a combination of multipledifferent shapes. All the shape designs of the protrusion 30 and thegroove 40 will be effective as long as they can prevent the radialdisplacement in the anti-loosening screw pair 100, and shall also fallwithin the protection scope of the anti-loosening screw pair 100according to the embodiments of the present disclosure.

According to one embodiment of the present disclosure, the internalscrew thread and the external screw thread respectively includes aconvex feature and a concave feature to be meshed together (i.e., oneincludes a convex feature, and the other includes a correspondingconcave feature), or respectively includes both a convex feature and aconcave feature to be meshed together (i.e., the internal screw threadincludes both a convex feature and a concave feature, and the externalscrew thread includes both another concave feature and another convexfeature corresponding to the internal screw thread). The convex featureand the concave feature are called convex-concave features for short,and meshing engagement between the convex-concave features on theinternal and external screw threads may produce a restraining effect onthe radial displacement. The convex-concave features relating to thepresent embodiment may have varied shapes, for example, a triangular,rectangular, trapezoidal, curved, hook-like, folded or irregular shape,and may also be a combination of multiple shapes. This design method hasno limitation on the shapes of the convex-concave features, and all theshape designs will be effective as long as they can prevent the radialdisplacement.

The convex-concave features relating to the present embodiment should beable to bear the main interaction force between the internal andexternal threads, therefore the force-bearing fitting face will bepresented in a region where the convex-concave features are located. Ageometric dimension of the convex feature may be identical to or differfrom that of the concave feature engaged therewith, in the case thatthey are different, a discontinuous contact region may be formed betweenthe internal screw thread and the external screw thread, but this doesnot depart from the core principle of the design method provided by thepresent disclosure, that is, all the designs will be effective as longas they can prevent the radial displacement in the screw pair.

In addition, there is no limitation on the location and the quantity ofthe convex-concave features relating to the present embodiment on thethread fitting faces, the convex-concave features may either beperiodically arranged or non-periodically arranged, and all the designsthereof will be effective as long as they can prevent the radialdisplacement in the anti-loosening screw pair 100.

In some specific embodiments of the present disclosure, the firstfitting portion comprises a first stepped portion 50 arranged on thefirst screw component 10, and the second fitting portion comprises asecond stepped portion 60 arranged on the second screw component 20.Through engagement between the first stepped portion 50 and the secondstepped portion 60, the radial displacement in the anti-loosening screwpair 100 can be effectively prevented.

As shown in FIG. 16 to FIG. 18, the first stepped portion 50 may becomprise a stepped shape, the second stepped portion 60 may alsocomprise a corresponding stepped shape, and a restraining effect on theradial displacement in the anti-loosening screw pair 100 may be producedthrough meshing engagement between the first stepped portion 50 and thesecond stepped portion 60.

Optionally, in some specific embodiments of the present disclosure, thefirst fitting portion may comprise one or more first stepped portions50, and a plurality of first stepped portions 50 may be spaced apart onthe first fitting portion so as to be evenly or unevenly distributed.Also, the second fitting portion may comprise one or more second steppedportions 60, and a plurality of second stepped portions 60 may be spacedapart on the second fitting portion so as to be evenly or unevenlydistributed.

As shown in FIG. 16 and FIG. 17, one or more first stepped portions 50can be provided on the first fitting portion and they can be spacedapart thereon so as to be evenly or unevenly distributed. Further, oneor more second stepped portions 60 can be provided on the second fittingportion and they can be spaced apart thereon so as to be evenly orunevenly distributed. Through the meshing engagement between the firststepped portions 50 and the second stepped portions 60, the radialdisplacement in the anti-loosening screw pair 100 can be effectivelyprevented.

According to one embodiment of the present disclosure, a fittingclearance 70 may be presented between the first stepped portion 50 andthe second stepped portion 60.

As shown in FIG. 18, size of the first stepped portion 50 may not beidentical to that of the second stepped portion 60, so that the fittingclearance 70 is presented therebetween as the first stepped portion 50is engaged with the second stepped portion 60.

Optionally, in some specific embodiments of the present disclosure, ashape of the first stepped portion 50 is corresponding to that of thesecond stepped portion 60 so that they are closely engaged with eachother.

The shape of the first stepped portion 50 and that of the second steppedportion 60 may correspond to each other, and the first stepped portion50 may closely engaged with the second stepped portion 60.

According to one embodiment of the present disclosure, the internalscrew thread and the external screw thread respectively include steppedfeatures which are meshed with each other, and the meshing engagementbetween the stepped features may produce a restraining effect on theradial displacement. This design method has no limitation on thespecific shape of the stepped feature, and all the designs thereof willbe effective as long as they can prevent the radial displacement.

Since the stepped feature relating to the present embodiment should beable to bear the main interaction force between the internal andexternal threads, the force-bearing fitting faces will be found in aregion where the stepped features are located. A geometric dimension ofthe stepped feature on the internal screw thread may be identical to ordiffer from that of the stepped feature on the external screw thread, inthe case that they are different, a discontinuous contact region may beformed between the internal screw thread and the external screw thread,but this does not depart from the core principle of the design methodproduced by the present disclosure, that is, all the designs will beeffective as long as they can prevent the radial displacement in thescrew pair.

In addition, there is no limitation on the location and the quantity ofthe stepped features relating to the present embodiment on the threadfitting faces, the stepped feature may be a single step, and may also bea plurality of periodical or non-periodical arranged steps, and all thedesigns thereof will be effective as long as they can prevent the radialdisplacement.

In some specific embodiments of the present disclosure, thenon-force-bearing fitting region of the first screw component 10 and/orthe second screw component 20 is provided with the stopper.

The stopper may be formed in the non-force-bearing fitting region of thefirst screw component 10, and may also be formed in thenon-force-bearing fitting region of the second screw component 20. Thestoppers may also be formed in the non-force-bearing fitting regions ofthe first screw component 10 and the second screw component 20simultaneously to effectively prevent the radial displacement from beingproduced when the anti-loosening screw pair 100 is tightened. There isno limitation on the shape and the quantity of the stoppers formed inthe non-force-bearing fitting regions, and all the designs thereof willbe effective as long as they can prevent the radial displacement. Theshape and the quantity of the stoppers formed in the non-force-bearingfitting regions may be similar to that on the force-bearing fittingfaces.

According to one embodiment of the present disclosure, as shown in FIG.19, non-force-bearing fitting regions of the first screw component 10and of the second screw component 20 are provided with the stopperrespectively.

The stoppers may be formed in the non-force-bearing fitting regions ofthe first screw component 10 and the second screw component 20respectively, and through engagement between the stopper of the firstscrew component 10 and the stopper of the second screw component 20, theradial displacement in the anti-loosening screw pair 100 may beeffectively prevented.

In some specific embodiments of the present disclosure, the stopperincludes a third fitting portion arranged in the non-force-bearingfitting region of the first screw component 10 and a fourth fittingportion arranged in the non-force-bearing fitting region of the secondscrew component 20, and the third fitting portion is engaged with thefourth fitting portion so as to prevent the radial displacement betweenthe first screw component 10 and the second screw component 20.

The third fitting portion may comprise a protrusion 30 arranged on thefirst screw thread, the fourth fitting portion may comprise a groove 40arranged in the second screw thread, and the protrusion 30 is clippedinto the groove 40.

The third fitting portion may also comprise a groove 40 arranged in thefirst screw thread, the fourth fitting portion may also comprise aprotrusion 30 arranged on the second screw thread, and the protrusion 30is clipped into the groove 40.

The third fitting portion may also comprise both a protrusion 30 and agroove 40 arranged on and in the first screw thread, and the fourthfitting portion may also comprise both a groove 40 and a protrusion 30arranged in and on the second screw thread. The protrusion 30 of thefirst screw thread is clipped into the groove 40 of the second screwthread, and the protrusion 30 of the second screw thread is clipped intothe groove 40 of the first screw thread.

The stopper may include the third fitting portion formed in thenon-force-bearing fitting region of the first screw component 10 and afourth fitting portion formed in the non-force-bearing fitting region ofthe second screw component 20, and the third fitting portion may engagedwith the fourth fitting portion so as to prevent the radial displacementbetween the first screw component 10 and the second screw component 20.

The specific designs of the third fitting portion and the fourth fittingportion may be approximately similar to that of the previously describedfirst fitting portion and second fitting portion.

The design of the third fitting portion in the non-force-bearing fittingregion may be approximately similar to that of the first fitting portionon the force-bearing fitting face, and the design of the fourth fittingportion in the non-force-bearing fitting region may be approximatelysimilar to that of the second fitting portion on the force-bearingfitting face. There is no definite limitation on the specific designs ofthe third fitting portion and the fourth fitting portion, and all thedesigns thereof will be effective as long they can prevent the radialdisplacement between the first screw component 10 and the second screwcomponent 20.

In some specific embodiments of the present disclosure, as shown in FIG.19, the third fitting portion comprises the protrusion 30 arranged onthe first screw thread, the fourth fitting portion comprises the groove40 arranged in the second screw thread, and the protrusion 30 is clippedinto the groove 40.

The third fitting portion may comprise the protrusion 30 on the firstscrew thread, the fourth fitting portion may comprise the groove 40 inthe second screw thread, the protrusion 30 may be clipped into thegroove 40, and the meshing engagement between the protrusion 30 and thegroove 40 may produce a restraining effect on the radial displacement inthe anti-loosening screw pair 100.

In some specific embodiments of the present disclosure, theforce-bearing fitting face and the non-force-bearing fitting region ofthe first screw component 10 and/or second screw component 20 areprovided with the stopper respectively.

The force-bearing fitting face and the non-force-bearing fitting regionof the first screw component 10 may comprise the stopper simultaneously,and the force-bearing fitting face and the non-force-bearing fittingregion of the second screw component 20 may comprise the stoppersimultaneously. The force-bearing fitting faces and thenon-force-bearing fitting regions of the first screw component 10 andthe second screw component 20 may simultaneously comprise the stoppersto effectively prevent the radial displacement from being generated whenthe anti-loosening screw pair 100 is tightened.

In some specific embodiments of the present disclosure, as shown in FIG.20, the force-bearing fitting faces and the non-force-bearing fittingregions of the first screw component 10 and the second screw component20 are provided with the stopper respectively.

In FIG. 20, the stopper may be formed on the force-bearing fitting facesof the first screw component 10 and the second screw component 20respectively. By forming the stoppers on the force-bearing fitting facesand the non-force-bearing fitting regions of the first screw component10 and the second screw component 20 respectively, the stoppers on theforce-bearing fitting faces comprise the first fitting portion and thesecond fitting portion respectively, and the stoppers in thenon-force-bearing fitting regions comprise the third fitting portion andthe fourth fitting portion respectively. The first fitting portion maycomprise the protrusion 30 on the first screw thread, the second fittingportion may comprise the groove 40 in the second screw thread, the thirdfitting portion may comprise the protrusion 30 on the first screwthread, the fourth fitting portion may comprise the groove 40 on thesecond screw thread, and the protrusions 30 and the groove 40 on and inthe force-bearing fitting faces and the non-force-bearing fittingregions may be meshed with each other to further restrain the radialdisplacement of the anti-loosening screw pair 100 from occurring in use.

In some specific embodiments of the present disclosure, the respectivecross sections of the first screw thread and the second screw thread areapproximately formed into triangular, trapezoidal, rectangular or zigzagshapes on which the respective stoppers are provided.

Although the respective cross sections of the first screw thread and thesecond screw thread may be approximately formed into triangular,trapezoidal, rectangular or zigzag shapes on which the respectivestoppers are provided, the specific shapes of the first screw thread andthe second screw thread are not limited to the above-described shapes.All the shape designs thereof will be effective as long as a restrainingeffect can be exerted on the radial displacement in the anti-looseningscrew pair 100, and shall all fall within the protection scope of theanti-loosening screw pair 100 according to the embodiments of thepresent disclosure.

In general, by arranging the stopper on at least one of theforce-bearing fitting faces and the non-force-bearing fitting regions ofthe first screw component 10 and the second screw component 20, theanti-loosening screw pair 100 according to the embodiments of thepresent disclosure effectively prevents the radial displacement betweenthe first screw component 10 and the second screw component 20 so as toincrease connection tightness of the anti-loosening screw pair 100. Theanti-loosening screw pair 100 is therefore easy to be disassembled,convenient for repeatedly usage, and has high fatigue strength,appropriate tightening torque as well as a broad application range.

An anti-loosening screw component according to a second aspect of thepresent disclosure will be described specifically hereinafter on thebasis of the anti-loosening screw pair 100 according to the aboveembodiments.

The anti-loosening screw component according to the second aspect of thepresent disclosure includes both the first screw component 10 providedwith the stopper and the second screw component 20 provided with thestopper in the anti-loosening screw pair 100 according to the aboveembodiments. The anti-loosening screw component may consist of the firstscrew component 10 provided with the stopper, and may also consist ofthe second screw component 20 provided with the stopper. Optionally, inthe case that the anti-loosening screw component consists of the firstscrew component 10, the force-bearing fitting face and/or thenon-force-bearing fitting region of the first screw component 10 isprovided with the stopper, and in the case that the anti-loosening screwcomponent consists of the second screw component 20, the force-bearingfitting face and/or the non-force-bearing fitting region of the secondscrew component 20 is provided with the stopper.

If the first screw component 10 and the second screw component 20comprised in the above anti-loosening screw pair 100 are provided withthe above stoppers, then each of which is called an anti-loosening screwcomponent and fall within the protection scope of the presentdisclosure. It should be noted that, the anti-loosening screw componentmay be a complete part including a thread feature (an internal thread oran external thread), such as a screw nut, a screw cap, a bolt, a screwnail etc., and may also be a partial region on a complex structureincluding the thread feature (the internal thread or the externalthread), such as a partial region on an engine cylinder block providedwith an internal thread, or an end region on an engine spindle providedwith an external thread etc.

The anti-loosening screw component consists of the first screw component10 and the anti-loosening screw component consists of the second screwcomponent 20 may be used in sets to compose the anti-loosening screwpair 100 according to the embodiment of the present disclosure. Theanti-loosening screw component consists of the first screw component 10and the anti-loosening screw component consists of the second screwcomponent 20 may also be individually used as anti-loosening structuresrespectively.

According to one embodiment of the present disclosure, the first screwcomponent 10 including the protrusion 30 (provided on the force-bearingfitting face and/or in the non-force-bearing fitting region) maycomprise an individual screw nut structure, which may constitute ananti-loosening screw component, and may engaged with an ordinary bolt soas to prevent radial displacement between the bolt and the screw nut bythe stopper on the screw nut. The first screw component 10 shown in FIG.1 to FIG. 3 is an example of the anti-loosening screw componentconforming to this embodiment.

In some specific embodiments of the present disclosure, the second screwcomponent 20 including the protrusion 30 (provided on the force-bearingfitting face and/or in the non-force-bearing fitting region) maycomprise an individual bolt structure, which may constitute ananti-loosening screw component, and may engaged with an ordinary screwnut so as to prevent radial displacement between the bolt and the screwnut by the stopper on the bolt.

Optionally, according to one embodiment of the present disclosure, thesecond screw component 20 including the protrusion 30 and/or the groove40 (provided on the force-bearing fitting face and/or thenon-force-bearing fitting region) may also comprise an individualtapping thread structure. The individual tapping thread structure mayconstitute the anti-loosening screw component, and may be directlyscrewed into a portion to be installed (such as wood, plastic, metallicmaterial, wall etc.) to form an internal thread feature inside theportion (in such a case, the portion to be installed served as the firstscrew component) approximately through pressing effect and the likewhich is engaged with the external thread on the tapping threadstructure, in such a case, the stopper on the tapping thread structuremay functioned to prevent radial displacement between the self-tappingthread structure and the portion to be installed, thus ensuringstability of the installation.

Both of the first screw component 10 provided with the stopper and thesecond screw component 20 provided with the stopper in the aboveanti-loosening screw pair 100 may constitute the anti-loosening screwcomponent, and the specific structures thereof are identical with thatin the related description of the above anti-loosening screw pair 100,which will not be repeated herein.

The anti-loosening screw pair 100 according to the present disclosurewill be described hereinafter by referring to the accompanying drawingsin conjunction with some specific embodiments. As shown in FIG. 1 toFIG. 3, an anti-loosening screw pair 100 in a first embodiment is mainlycomposed of a first screw component 10 and a second screw component 20.The first screw component 10 is provided with an inner hole, and a firstscrew thread extending along its spiral line may be formed on the innerwall surface of the inner hole. The second screw component 20 may beprovided with an approximately rod shape, and a second screw threadextending along its spiral line may be formed on the outer wall surfaceof the second screw component 20 and corresponding to the first screwthread. In the first embodiment, the first screw component 10 is screwedto the left with respect to the second screw component 20 to formforce-bearing fitting faces and non-force-bearing fitting regionsthereon.

The force-bearing fitting face of the second screw thread may be formedinto a flat surface, a curved surface or other shapes, a stopper may beformed on the force-bearing fitting face of the first screw thread andcomprise a protrusion 30 protruding toward the force-bearing fittingface of the second screw thread. The first screw thread may have one ormore protrusions 30, and the shape of the protrusion 30 may be of an arcor a sharp angle. In the process of the anti-loosening screw pair 100being tightened, the protrusion 30 may press against the force-bearingfitting face of the second screw thread such that the latter isdeformed, which ensures meshing engagement between the first screwthread and the second screw thread on their force-bearing fitting facesto achieve an object of restraining the radial displacement between theforce-bearing fitting faces of the anti-loosening screw pair 100. Asshown in FIG. 4 to FIG. 14, the main structure of an anti-looseningscrew pair 100 in a second embodiment is basically identical with thatof the above first embodiment. In the second embodiment, a first screwcomponent 10 is tightened to the left with respect to a second screwcomponent 20 to form force-bearing fitting faces and non-force-bearingfitting regions thereon. Both the force-bearing fitting faces of thefirst screw thread and the second screw thread are provided withstoppers, i.e., a first fitting portion and a second fitting portionrespectively, wherein the first fitting portion may comprise aprotrusion 30 on the first screw thread, the second fitting portion maycomprise a groove 40 in the second screw thread, and one or moreprotrusions 30 and one or more grooves 40 may be provided. Theprotrusion 30 may have a triangular, rectangular, trapezoidal, curved,hook-like, folded or irregular shape, and the shape of the protrusion 30may also be a combination of multiple shapes. In addition, in FIGS. 11to 14, the first fitting portion may comprise both a protrusion 30 and agroove 40 on the first screw thread, the second fitting portion maycomprise both a groove 40 and a protrusion 30 on the second screwthread, the protrusion 30 on the first screw thread may be clipped intothe groove 40 in the second screw thread, and the protrusion 30 on thesecond screw thread may also be clipped into the groove 40 in the firstscrew thread. As a matter of course, all of the specific shapes of theprotrusion 30 will be effective as long as they can prevent the radialdisplacement in the anti-loosening screw pair 100, and shall all fallwithin the protection scope of the anti-loosening screw pair 100according to the embodiment of the present disclosure. As shown in FIG.15, the main structure of an anti-loosening screw pair 100 according toa third embodiment is basically identical with that of the aboveembodiments. In the third embodiment, a first screw component 10 istightened to the left with respect to a second screw component 20 toform force-bearing fitting faces and non-force-bearing fitting regionsthereon. A first fitting portion may comprise both a protrusion 30 and agroove 40 on the first screw thread, a second fitting portion maycomprise both a groove 40 and a protrusion 30 on the second screwthread, the protrusion 30 on the first screw thread may be clipped intothe groove 40 in the second screw thread, and the protrusion 30 on thesecond screw thread may also be clipped into the groove 40 in the firstthread, to prevent radial displacement in the anti-loosening screw pair100. The size of the protrusion 30 may be different from that of thegroove 40, so that a fitting clearance 70 is presented therebetween whenthey are engaged with each other. As shown in FIG. 16 to FIG. 18, themain structure of an anti-loosening screw pair 100 according to a fourthembodiment is basically identical with that of the above embodiments. Inthe fourth embodiment, a first screw component 10 is tightened to theleft with respect to a second screw component 20 to form force-bearingfitting faces and non-force-bearing fitting regions thereon. A firstfitting portion comprises a first stepped portion 50 on the first screwcomponent, and a second fitting portion comprises a second steppedportion 60 on the second screw component 20. The first stepped portion50 may comprise a step-like shape and there may be one ore more firststepped portions 50, the first stepped portions 50 are engaged with thesecond stepped portions 60 so as to prevent radial displacement in theanti-loosening screw pair 100. The respective sizes of the first steppedportions 50 may be identical or different, and the first steppedportions 50 may also engaged with the second stepped portions 60 to forma fitting clearance 70 therebetween. As shown in FIG. 19, the mainstructure of an anti-loosening screw pair 100 according to a fifthembodiment is basically identical with that of the above embodiments. Inthe fifth embodiment, a first screw component 10 is tightened to theleft with respect to a second screw component 20 to form force-bearingfitting faces and non-force-bearing fitting regions thereon.Non-force-bearing fitting regions of the first screw component 10 andthe second screw component 20 are provided with stoppers, i.e., a thirdfitting portion and a fourth fitting portion respectively, wherein thethird fitting portion may comprise a protrusion 30 on the first screwthread and the fourth fitting portion may comprise a groove 40 in thesecond screw thread. Through engagement between the stoppers of thefirst screw component 10 and of the second screw component 20, radialdisplacement in the anti-loosening screw pair 100 may be effectivelyprevented. As shown in FIG. 20, the main structure of an anti-looseningscrew pair 100 according to a sixth embodiment is basically identicalwith that of the above embodiments. In the sixth embodiment, a firstscrew component 10 is tightened to the left with respect to a secondscrew component 20 to form force-bearing fitting faces andnon-force-bearing fitting regions thereon, and force-bearing fittingfaces and the non-force-bearing fitting regions of the first screwcomponent 10 and the second screw component 20 are provided withstoppers, the stoppers on the force-bearing fitting faces referred to afirst fitting portion and a second fitting portion respectively, and thestoppers on the non-force-bearing fitting regions are referred to athird fitting portion and a fourth fitting portion respectively. Thefirst fitting portion may comprise a protrusion 30 on the first screwthread, the second fitting portion may comprise a groove 40 in thesecond screw thread, the third fitting portion may comprise a protrusion30 on the first screw thread, the fourth fitting portion may comprise agroove 40 in the second screw thread, and the protrusions 30 and thegrooves 40 on the force-bearing fitting faces and the non-force-bearingfitting regions may be meshed with each other to effectively preventradial displacement in the anti-loosening screw pair 100.

All of the first screw components 10 and the second screw components 20provided with the stopper in the above first to sixth embodiments mayserve as examples of the anti-loosening screw component according to thepresent disclosure.

The above are merely the preferred embodiments of the presentdisclosure, it should be noted that, a person skilled in the art maymake improvements and modifications without departing from the principleof the present disclosure, and these improvements and modificationsshall also fall within the protection scope of the present disclosure.

1. An anti-loosening screw pair, comprising: a first screw componenthaving an inner hole, an inner wall surface of the inner hole beingprovided with a first screw thread extending along a spiral linethereof; and a second screw component having a rod-shaped structure, anouter wall surface of the rod-shaped structure being provided with asecond screw thread extending along a spiral line thereof andcorresponding to the first screw thread, and the second screw componentbeing in threaded connection with the first screw component, wherein ina direction of the first screw component being screwed into the secondscrew component, sides of the first screw thread and the second screwthread pressing against each other are formed into force-bearing fittingfaces respectively, opposite sides thereof are formed intonon-force-bearing fitting regions respectively, and at least one of theforce-bearing fitting faces and the non-force-bearing fitting regions ofthe first screw component and the second screw component is providedwith a stopper so as to prevent radial displacement between the firstscrew component and the second screw component.
 2. The anti-looseningscrew pair according to claim 1, wherein the force-bearing fitting faceof the first screw component and/or the second screw component isprovided with the stopper, or wherein the non-force-bearing fittingregion of the first screw component and/or the second screw component isprovided with the stopper, or wherein the force-bearing fitting face andthe non-force-bearing fitting region of the first screw component and/orthe second screw component are provided with the stoppers respectively.3. The anti-loosening screw pair according to claim 2, wherein in thecase that the force-bearing fitting face of the first screw componentand/or the second screw component is provided with the stopper, one ofthe first screw component and the second screw component is providedwith the stopper, or the first screw component and the second screwcomponent are provided with the stoppers respectively.
 4. (canceled) 5.The anti-loosening screw pair according to claim 3, wherein in the casethat the force-bearing fitting face of the first screw thread isprovided with the stopper, the stopper comprises a protrusion protrudingtoward the force-bearing fitting face of the second screw thread, theprotrusion presses against the force-bearing fitting face of the secondscrew thread as the first screw component and the second screw componentare being screwed together so as to form a groove therein, theprotrusion is engaged with the groove so as to prevent the radialdisplacement between the first screw component and the second screwcomponent, and the stopper comprises on or more protrusions. 6.(canceled)
 7. (canceled)
 8. The anti-loosening screw pair according toclaim 3, wherein in the case that the first screw component and thesecond screw component are provided with the stoppers respectively, thestopper comprises a first fitting portion arranged on the first screwcomponent and a second fitting portion arranged on the second screwcomponent, and the first fitting portion is engaged with the secondfitting portion so as to prevent the radial displacement between thefirst screw component and the second screw component.
 9. Theanti-loosening screw pair according to claim 5, wherein the firstfitting portion comprises a protrusion arranged on the first screwthread, the second fitting portion comprises a groove arranged in thesecond screw thread, and the protrusion is clipped into the groove; orwherein the first fitting portion comprises a groove arranged in thefirst screw thread, the second fitting portion comprises a protrusionarranged on the second screw thread, and the protrusion is clipped intothe groove; or wherein the first fitting portion comprises both aprotrusion arranged on the first screw thread and a groove arranged inthe first screw thread, the second fitting portion comprises both agroove arranged in the second screw thread and a protrusion arranged onthe second screw thread, the protrusion on the first screw thread isclipped into the groove in the second screw thread, and the protrusionon the second screw thread is clipped into the groove in the first screwthread.
 10. (canceled)
 11. (canceled)
 12. The anti-loosening screw pairaccording to claim 6, wherein a fitting clearance is presented betweenthe protrusion and the groove engaged therewith, or wherein a shape ofthe protrusion corresponds to that of the groove engaged therewith andthe protrusion is closely engaged with the groove.
 13. (canceled) 14.The anti-loosening screw pair according to claim 6, wherein one or moreprotrusions and one or more grooves are provided.
 15. The anti-looseningscrew pair according to claim 5, wherein the first fitting portioncomprises a first stepped portion arranged on the first screw component,the second fitting portion comprises a second stepped portion arrangedon the second screw component, and the first fitting portion comprisesone or more first stepped portions.
 16. The anti-loosening screw pairaccording to claim 15, wherein the first fitting portion comprises oneor more first stepped portions.
 17. The anti-loosening screw pairaccording to claim 1, wherein the non-force-bearing fitting region ofthe first screw component and/or the second screw component is providedwith the stopper.
 18. The anti-loosening screw pair according to claim2, wherein in the case that the non-force-bearing fitting region of thefirst screw component and/or the second screw component is provided withthe stopper, the non-force-bearing fitting regions of the first screwcomponent and the second screw component are provided with the stoppersrespectively.
 19. The anti-loosening screw pair according to claim 10,wherein the stopper comprises a third fitting portion arranged on thefirst screw component and a fourth fitting portion arranged on thesecond screw component, and the third fitting portion is engaged withthe fourth fitting portion so as to prevent the radial displacementbetween the first screw component and the second screw component. 20.The anti-loosening screw pair according to claim 10, wherein the thirdfitting portion comprises a protrusion arranged on the first screwthread, the fourth fitting portion comprises a groove arranged in thesecond screw thread, and the protrusion is clipped into the groove, orwherein the third fitting portion comprises a groove arranged in thefirst screw thread, the fourth fitting portion comprises a protrusionarranged on the second screw thread, and the protrusion is clipped intothe groove; or wherein the third fitting portion comprises both aprotrusion arranged on the first screw thread and a groove arranged inthe first screw thread, the fourth fitting portion comprises both agroove arranged in the second screw thread and a protrusion arranged onthe second screw thread, the protrusion on the first screw thread isclipped into the groove in the second screw thread, and the protrusionon the second screw thread is clipped into the groove in the first screwthread.
 21. (canceled)
 22. (canceled)
 23. The anti-loosening screw pairaccording to claim 12, wherein a fitting clearance is presented betweenthe protrusion and the groove engaged therewith, or wherein a shape ofthe protrusion corresponds to that of the groove engaged therewith andthe protrusion is closely engaged with the groove.
 24. (canceled) 25.The anti-loosening screw pair according to claim 12, wherein one or moreprotrusions and one or more grooves are provided.
 26. (canceled)
 27. Ananti-loosening screw component comprising the first screw component orthe second screw component according to claim 1, wherein theforce-bearing fitting face and/or the non-force-bearing fitting regionof the first screw component or the second screw component is providedwith the stopper, and wherein the anti-loosening screw componentcomprises the first screw component and the force-bearing fitting faceand/or the non-force-bearing fitting region of the first screw componentis provided with the stopper, or the anti-loosening screw componentcomprises the second screw component and the force-bearing fitting faceand/or the non-force-bearing fitting region of the second screwcomponent is provided with the stopper.
 28. (canceled)
 29. (canceled)